CN104898055B - Motor status determination methods and device - Google Patents
Motor status determination methods and device Download PDFInfo
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- CN104898055B CN104898055B CN201410077813.0A CN201410077813A CN104898055B CN 104898055 B CN104898055 B CN 104898055B CN 201410077813 A CN201410077813 A CN 201410077813A CN 104898055 B CN104898055 B CN 104898055B
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Abstract
The present invention provides a kind of motor status determination methods, in the state of with transducer drive motor, in the motor status determination methods, the frequency and current value of the output current of frequency converter are sampled, and according to the frequency and current value of the output current sampled, the near sinusoidal change curve of output current is drawn, is occurred in the output current of frequency converter abnormal（Overcurrent）When, whether fallen on the near sinusoidal curent change curve drawn out by the current value for the output current for judging actually to measure, to judge the running status of motor, if fall on sinusoidal current change curve, then it is judged as that motor is in locked rotor condition, if not falling within sinusoidal current change curve, it is judged as that electric current is in overexcitation state.
Description
Technical field
The present invention relates to a kind of motor status determination methods and device, more particularly to a kind of output by frequency converter
Electric current is sampled and analyzed, to judge the motor status determination methods of the running status of motor and device.
Background technology
Generally, transducer drive asynchronous machine is being used（Below, referred to as motor）When, due to the rotating speed and electromagnetism of motor
Relation between torque is the mechanical property of motor, and the reason for equipment inertia of system etc., motor can not be normal sometimes
Operation.At this time, it may be necessary to be adjusted to the parameter of frequency converter, to meet the requirement of industry spot, make up some and potentially ask
Topic, electric machine control system is set to reach optimal matching status with mechanical system.
When with transducer drive new motor, because the reason for above-mentioned mechanical performance etc., causes frequency converter and motor
During Incomplete matching, it may appear that the situation of the output current overcurrent of frequency converter.The phenomenon of this overcurrent can cause frequency converter
The switch element such as IGBT be damaged because electric current is excessive, motor can be also burned because exciting current etc. is excessive.
In order that motor can it is safe and stable, normally operation, it is necessary to according in the output current overcurrent of frequency converter
The running status of motor, correctly adjust the parameter of frequency converter.The operation shape of motor in the output current overcurrent of frequency converter
State typically has two kinds of situations of motor rotation blockage and motor overexcitation.
When load excessive or too high initiation culture, the phenomenon of stall occurs in motor.There are the feelings of stall in motor
Under condition, power factor is low during because of motor rotation blockage, and locked rotor current raises rapidly, frequency converter temperature also rapid increase.For example, to electricity
In the case that the mode that machine is controlled is U/F controls, according to the output frequency of frequency converter, what kind of measure judged to take,
Which judge parameter of frequency converter is adjusted.When load excessive etc. causes the output frequency very little of frequency converter（It is for example, right
For powerful motor, the frequency less than 5Hz）When, then it is assumed that inappropriate, to drive load electricity is controlled to motor
Magnetic torque is less than load torque, it is necessary to increase gain of torque to start motor.When the output frequency of frequency converter is excessive, then it is assumed that
Under the influence of the inertia of the rotor of electronics because the output frequency of frequency converter is excessive cause motor stator and rotor slip
Rate is excessive（S=1）So that rotor can not follow the speed of the rotating excitation field of stator.Therefore, now need to reduce the defeated of frequency converter
Go out frequency, that is, reduce the speed of the rotating excitation field of stator, to reduce revolutional slip, so as to solve the problems, such as the stall of motor.
When the output frequency of frequency converter changes, the internal driving of motor also changes therewith, so as to cause exciting current
Change, this exciting current increase sometimes is excessive, motor the too strong situation of excitation, the magnetic induction intensity of electric machine iron core is occurred
No longer dramatically increase, applied voltage is higher than the rated voltage of motor, and causes motor to produce magnetic saturation, now, easily burns out electricity
Machine.In this case, it is necessary to reduce the output voltage of frequency converter, that is, the voltage for being applied to motor is reduced, to reduce excitation voltage,
To reduce exciting current.On the other hand, in the output frequency very little of frequency converter, due to the rate of change very little of frequency, motor
Electric energy can not be effectively transferred to rotor caused by the rotating excitation field of stator, in this case, anti-electronic caused by motor
Gesture very little, also result in motor and overexcitation phenomenon occur, at this time, it may be necessary to reduce the acceleration time of frequency converter, increase frequency converter
Acceleration, motor is set quickly to start.
As described above, when using transducer drive motor, if can not normally start the fortune of motor or motor
There is exception in row state, then needs the running status according to motor（It is motor rotation blockage or motor overexcitation）It is appropriate to select
Solution method.
However, because the commissioning staff at scene is difficult to simply confirm whether the mechanical performance of motor meets current work
State, it is also difficult to the factors such as the inertia of system are obtained, so as to be difficult to accurately and timely judge the running status of motor（Sentence
Power machine is in order at stall and is in overexcited state）.Therefore, often take a lot of time, also, adjusting in debugging
During examination, too many electric energy can be wasted, does not meet environmental protection and the requirement of energy-conservation.Even, some tune for lacking commissioning experience
Examination personnel can blindly change the parameter of some frequency converters, cause frequency converter to be mismatched with mechanical system, and ultimately result in frequency conversion
Device damages.
Therefore, accurately and timely judge that the means of the running status of motor are particularly important.
From the perspective of control, the rotary speed information that frequency converter can obtain rotor realizes that motor status judge
Important means.The most common means for the rotary speed information that known acquisition frequency converter can obtain rotor are, on motor shaft
Speed encoder is loaded onto, however, this can cause the increase of frequency converter hardware and installation and equipment and maintenance cost, moreover,
There is the situation that restrictive condition does not allow installation rate encoder in scene.
In the case where being fitted without speed encoder, it is necessary to the output current based on the frequency converter i.e. electric current of motor stator
To judge motor status.
The content of the invention
When a kind of output current in frequency converter of present invention offer produces overcurrent, pass through the output electricity obtained based on sampling
The value and frequency of stream and the curent change curve of near sinusoidal drawn out, to judge the motor status determination methods of motor status
And device.
The present invention provides a kind of motor status determination methods, and it is used in the state of with transducer drive motor, right
The running status of motor is judged, it is characterised in that is comprised the following steps：Current value to the output current of frequency converter and
The sampling step that frequency is sampled, according to the current value and frequency of the output current sampled, to draw near sinusoidal
Curent change curve draw step, judge the output current whether the alarming step of overcurrent, in the alarming step
In be judged as that the output current is overcurrent in the case of, to the current value of the output current that is sampled with drawing out
The near sinusoidal the comparison step that is compared of curent change curve, according to the comparison obtained in the comparison step
As a result, the judgment step of the running status of motor is judged.
In the present invention, it is preferred to the sampling step has：First sampled to the frequency of the output current
Sampling step, the second sampling step sampled to the current value of the output current.
In the present invention, it is preferred to first sampling step includes：By zero-crossing comparator to the described defeated of frequency converter
Go out the step of the first zero crossing of electric current is sampled, the second mistake by zero-crossing comparator to the output current of frequency converter
The step of zero point is sampled, second zero crossing is next zero crossing of first zero crossing, according to described first
The sampling time of zero crossing and second zero crossing, the step of to calculate the frequency of the output current.
In the present invention, it is preferred in the judgment step, when the comparative result is described in some sampled point
The current value of output current is corresponding with the sampled point with the curent change curve for the near sinusoidal drawn out
When the difference of current value is not above permissible range, it is judged as that motor is in the state of stall, when the comparative result is at certain
The current value of the output current of individual sampled point with the curent change curve for the near sinusoidal drawn out with
When the difference of current value corresponding to the sampled point exceedes permissible range, it is judged as that motor is in overexcitation state.
In the present invention, it is preferred to draw step described, the output current is drawn with Maclaurin formula
Near sinusoidal curent change curve.
The present invention also provides a kind of motor status judgment means, and it is used in the state of with transducer drive motor,
The running status of motor is judged, it is characterised in that including：Current value and frequency to the output current of frequency converter are carried out
The sampling module of sampling, according to the current value and frequency of the output current sampled, become to draw the electric current of near sinusoidal
Change curve depicting module, judge the output current whether the alarm module of overcurrent, be judged as institute in the alarm module
In the case of output current is stated as overcurrent, the current value of the output current to being sampled is described approximate with what is drawn out
The comparison module that sinusoidal curent change curve is compared, according to the comparative result of the comparison module, to judge motor
The judge module of running status.
In the present invention, it is preferred to the sampling module has：First sampled to the frequency of the output current
Sampling module, the second sampling module sampled to the current value of the output current.
In the present invention, it is preferred to which first sampling module includes zero-crossing comparator, pass through the zero-crossing comparator pair
First zero crossing of the output current of frequency converter is sampled, and passes through the output of the zero-crossing comparator to frequency converter
Second zero crossing of electric current is sampled, and second zero crossing is next zero crossing of first zero crossing, and described the
One sampling module is according to sampling time of first zero crossing and second zero crossing, to calculate the frequency of the output current
Rate.
In the present invention, it is preferred to when the comparative result is the current value in the output current of some sampled point
The difference of current value corresponding with the sampled point does not have with the curent change curve for the near sinusoidal drawn out
During more than permissible range, the judge module is judged as that motor is in the state of stall, when the comparative result is to be adopted at some
The current value of the output current of sampling point and being adopted with this on the curent change curve for the near sinusoidal drawn out
When the difference of current value corresponding to sampling point exceedes permissible range, the judge module is judged as that motor is in overexcitation state.
In the present invention, it is preferred to the describing device draws the near of the output current with Maclaurin formula
Like sinusoidal variations curve.
, can simply, soon when starting motor using frequency converter according to the motor status determination methods and device of the present invention
The running status of motor is judged fastly, in order to make appropriate counter-measure.In accordance with the invention it is possible to reduce to debugging people
The requirement of the debugging capability of member, reduce the time needed for debugging motor and reduce the waste of electric energy, moreover, can be reliablely and stablely
Motor is run, frequency converter and the unnecessary damage of motor is avoided, fully realizes cost-effective purpose.
Brief description of the drawings
Fig. 1 is the stator current for schematically showing motor under different running statuses（The output current of frequency converter）'s
Oscillogram.
Fig. 2 is the overview flow chart for the motor status determination methods for representing present embodiment.
Fig. 3 is to represent that the frequency in the output current to frequency converter in present embodiment passes in and out used mistake when sampling
The circuit diagram of zero comparator.
Fig. 4 is the flow chart that the frequency for the output current to frequency converter for representing present embodiment is sampled.
Fig. 5 is the block diagram for the motor status judgment means for representing present embodiment.
Embodiment
Below, referring to the drawings, embodiments of the present invention are illustrated.
Fig. 1 is the stator current for representing motor under different running statuses（The output current of frequency converter）Oscillogram.
Generally, it is different according to the running status of motor, the output current of frequency converter be the waveform of motor stator electric current not yet
Together.As shown in figure 1, in the case where motor produces stall, the output current of frequency converter is motor stator electric current and frequency converter
The command value that control circuit is sent to the electric current of frequency converter is identical（For example, the curve being represented by dashed line in Fig. 1）, so in the feelings
Under condition, although the current value when value of output current runs well than motor is much larger, the waveform of the output current of frequency converter
It is still sine curve.On the other hand, in the case of motor is in overexcited, the output current of frequency converter is motor stator electricity
The waveform of stream is not sine curve（For example, curve indicated by the solid line in Fig. 1）, it is defeated particularly when magnetic saturation occurs in motor
Go out electric current promptly to increase, the current value risen to when running well than motor is much larger.
Therefore, in the state of with transducer drive motor, in order to judge the running status of motor, it is necessary to obtain frequency conversion
The waveform of the output current of device, that is, need to sample the current value and frequency of the output current of frequency converter.In this embodiment party
In formula, by the value of output current to being obtained based on sampling and frequency and the curent change curve of near sinusoidal drawn out with
Actual output current is compared, to judge that motor is in any state.
The invention provides one kind to be used in the state of with transducer drive motor, and the running status of motor is carried out
The motor status determination methods of judgement.Hereinafter, the electrode condition determination methods are described in detail.Fig. 2 is to represent this reality
Apply the overview flow chart of the motor status determination methods of mode.
First, the frequency of the output current of frequency converter is sampled（Step S1）.Sampling to output current has a lot
Kind mode, in the present embodiment, to frequency converter（For example, the IP5A manufactured using LG）Output current frequency carry out adopt
Sample, it is that the zero crossing of the output current of frequency converter is sampled to realize using the hardware circuit zero-crossing comparator shown in Fig. 3
, but not limited to this.Due to only needing that time of the output current in zero crossing is sampled in this way, so energy
Enough in the case where exception occurs in motor, rapidly electric current is sampled in a short time, saves the time of processing.
Fig. 4 is the flow chart that the frequency for the output current to frequency converter for representing present embodiment is sampled.Such as Fig. 4 institutes
Show, in step ST2, a zero crossing t1 of the output current of frequency converter is detected, for example, output current is changed into small from more than 0
In 0 time point, in step ST3, next zero crossing t2 of output current is detected, for example, output current is changed into from less than 0
Time point more than 0.Then in step ST4, the cycle of output current is roughly calculated by t1, t2, output current
Cycle=（t2-t1）× 2, so as to calculate the frequency f of output current.
Then, Fig. 2 is returned, in step s 2, the current value of the output current of frequency converter is sampled（Only to three-phase electricity
One in stream is sampled, for example, being sampled to the electric current Iu of U phases）.The inspection carried out to the current value of output current
Survey can be carried out by general current sensor or current sampling circuit, it is for instance possible to use the IP5A of LG manufactures becomes
The intrinsic current sampling circuit for being used to detect output current value detects output current value in frequency device.To the electric current of output current
The time interval that value is sampled was determined by the cycle of the output current determined in step sl, for example, can incite somebody to action
Sampling time interval Δ x is set as：Cycle/n of sampling time interval Δ x=output currents（For example, n=40, i.e. a cycle
Inside take 40 sampled points）, so as to calculate the frequency fs of sampling, the current value I of output current is adopted using frequency fs
Sample.
After the current value I and frequency f of the output current of frequency converter is obtained, the curent change for drawing near sinusoidal is bent
Line（Step S3）.The method for drawing the curent change curve of near sinusoidal has many kinds, here, it is simple and quick to preferably select calculating
Method carry out for example, in the present embodiment, used the theory of infinite series, specifically, the present invention is with saving
The Maclaurin formula for calculating the time represents sample rate current, at phase theta=0 °, orderThen
Wherein, Im is the peak value of output current（The output is obtained in the above-mentioned step S2 sampled to current value
Current maxima）, ω is angular speed（Calculated by the π f of known formula ω=2）, in addition, according to the precision to calculating
With the value of the requirement of speed, suitably decision m, such as m=4.
In the method for the above-mentioned curent change curve that near sinusoidal is drawn using Maclaurin formula, directly to actual defeated
The peak I m for going out electric current is sampled, but not limited to this, and directly the peak value of actual output current can not be sampled, and
The current peak for being the curent change curve of shilling near sinusoidal is 1, and thereby, it is possible to deduce in the approximation that current peak is 1
Current value corresponding with each sampled point in current period on sinusoidal curent change curve.It is in such a case it is possible to right
Some sampled point（For example, first sampled point）Measured current value sampled, by the measured current value divided by deduce
It is worth obtained from current value corresponding with the sampled point on the curent change curve for the near sinusoidal that current peak is 1 and assumes
For the peak value of the output current, then, the defeated of actual frequency converter is judged as described later to draw based on the peak value and frequency
Go out the curent change curve of the near sinusoidal of the state of electric current.
Then, using frequency converter output current overcurrent protection function（Below, referred to as OCS functions）To detect output
Whether electric current is abnormal（Step S4）.When the OCS functions of frequency converter do not detect output current overcurrent, step S1 is returned to
Processing.When the OCS function warnings of frequency converter detect output current overcurrent, step S5 processing is advanced to.
Then, according to the current curve for the near sinusoidal drawn out in step s3, to judge the output for causing frequency converter
Electric current（Motor stator electric current）The reason for overcurrent, that is, it is to be in overexcited state in stall to judge motor.In step
In rapid S5, the near-sinusoidal drawn out the current peak according to the current period sampled and frequency with current period
The current value of interior each sampled point is compared, when in the current value of sampled point and on the near-sinusoidal drawn
When the difference of current value corresponding with the sampled point is in permissible range, it is believed that the waveform of the output current of frequency converter is with being drawn
Near sinusoidal curent change curve it is identical, that is, be judged as that motor is in locked rotor condition.When sampled point current value with
When the difference of current value corresponding with the sampled point on the near-sinusoidal drawn exceeds permissible range, it is believed that adopted at this
On the curent change curve for the near sinusoidal that the output current of the frequency converter of sampling point does not fall within and drawn.
Specifically, the measured current value of some sampled point xi in current period is set to Iu（xi）, will be adopted at this
Next sampled point xi+1 of sampling point measured current value is set to Iu（xi+1）, according to the actual output current of current period
Amplitude and frequency, in sampled point xi expression formula it is I using the near-sinusoidal that Maclaurin formula is drawn out（xi）, then should
Near-sinusoidal is I ' in current sampling point xi tangent slope（xi）, due to two（Sampled point xi and next sampled point
xi+1）The time interval Δ x of sampled point is very small（For example, cycle/40 of output current）, it is believed that through oversampled points xi and
The slope of next sampled point xi+1 straight line is similar to（In fact, slightly less than）In sampled point xi above-mentioned tangent slope I '
（xi）.Therefore, it is possible to pass through the tangent slope I ' in sampled point xi（xi）With the measured current value Iu in sampled point xi（xi）With
And sampling time interval Δ x, to speculate the substantially current value corresponding with next sampled point xi+1 on near-sinusoidal
Ic（xi+1）, Ic（xi+1）=Iu（xi）+I’（xi）×Δx.By to current value Ic（xi+1）With in next sampled point xi
+ 1 measured current value Iu（xi+1）It is compared, to judge the waveform of the actual output current of frequency converter whether with being drawn
The curent change curve of near sinusoidal is identical.
In the case where motor produces stall, the waveform of the output current of frequency converter and the curent change of above-mentioned near sinusoidal
Curve is similar（The absolute value of actual current value is slightly less than the absolute value of the current value deduced according to near-sinusoidal）,
Therefore, to the measured current value Iu in next sampled point xi+1（xi+1）With on the near-sinusoidal drawn with
Current value Ic corresponding to next sampled point xi+1（xi+1）The result being compared is Iu（xi+1）-Ic（xi+1）≤ allow
Be worth and | Iu（xi+1）|≤|Ic（xi+1）| in the case of, it is judged as that motor is in the state of stall（Step S6）.
In the case where motor is in overexcitation state, the output current of frequency converter will not fall according to the output sampled
On the near-sinusoidal that the peak value and frequency of electric current are drawn out, and the increased rate of change of actual output current is more than near sinusoidal
Curent change curve rate of change.Therefore, to the measured current value Iu in next sampled point xi+1（xi+1）With institute
Current value Ic corresponding with the next sampled point xi+1 on the near-sinusoidal drawn（xi+1）The result being compared
For Iu（xi+1）-Ic（xi+1）In the case of ＞ feasible values, it is judged as that motor is in overexcited state（Step S7）.
Thus, in the case where the OCS function warnings of frequency converter are the output current overcurrent of frequency converter, above-mentioned side is passed through
Formula judges that the running status of motor being able to confirm that needs to be adjusted which parameter of frequency converter, to meet industry
The requirement at scene.
It is used in addition, the present invention also provides one kind in the state of with transducer drive motor, the operation shape to motor
The motor status judgment means that state is judged, below, the motor status judgment means are illustrated.Fig. 5 is to represent this reality
Apply the block diagram of the motor status judgment means of mode.
Motor status judgment means include：Sampling module 11, it is used for frequency and electricity to the output current of frequency converter
Flow valuve is sampled；Depicting module 12, it is adopted in sampling module 11 to the current value and frequency of the output current of frequency converter
After sample, based on the current peak and frequency according to the current period sampled, the curent change curve of near sinusoidal is drawn；Report
Alert module 13, its detect output current whether overcurrent, equivalent to the overcurrent protection function module of the output current of frequency converter；Than
Compared with module 14, it is in the case where alarm module 13 is judged as output current overcurrent, the approximation drawn out depicting module 12
Sine curve is compared with the current value of each sampled point in current period；Judge module 15, it is according to comparison module
14 comparative result, to judge the running status of motor, that is, judge motor be in stall state be in it is overexcited
State.
In addition, as shown in figure 5, sampling module 11 can also include the first sampling module 111 and the second sampling module 112.
Wherein, the first sampling module 111 is used for sampling the frequency f of the output current of frequency converter, specifically, can use figure
Hardware circuit zero-crossing comparator shown in 3 is used as first sampling module 111, as described above, the output current to frequency converter
Two neighboring zero crossing t1, t2 sampled, by cycle of output current=（t2-t1）× 2, the calculating in the cycle of f=1/
Formula, to obtain the frequency f of output current of frequency converter.
Second sampling module 112 is used for sampling the current value I of the output current of frequency converter, as described above, only right
One in three-phase current is sampled.The output current that the time interval of sampling is obtained by the first sampling module 111
Cycle determine, as set forth above, it is possible to sampling time interval Δ x is set as：Sampling time interval Δ x=output currents
Cycle/n.
After being sampled by sampling module 11 to the current value I and frequency f of the output current of frequency converter, mould is drawn
Peak value and frequency of the block 12 based on the output current sampled, draw the curent change curve of near sinusoidal.The motor of the present invention
State judging device uses the theory of infinite series, for example, as set forth above, it is possible to drawing sampling electricity with Mike virgin forest formula
The change curve of stream.
The alarm module 13 of motor status judgment means samples the output current of obtained frequency converter based on sampling module 11
Current value, come detect output current whether overcurrent, when output current does not have overcurrent, alarm module 13 does not export letter
Number, when output current overcurrent, alarm module 13 exports the comparison signal for making comparison module 14 be compared action.
When comparison module 14 receives the comparison signal from alarm module 13, the approximation drawn out depicting module 12
Sine curve is compared with the current value of each sampled point in current period.
When in the current value of sampled point and the current value corresponding with the sampled point on the near-sinusoidal drawn
Difference in permissible range when, it is believed that the waveform of the output current of frequency converter and the curent change of near sinusoidal drawn are bent
Line is identical, and the judge module 15 of the alarm module 13 of motor status judgment means is judged as that motor is in locked rotor condition.When adopting
The difference of the current value of sampling point current value corresponding with the sampled point with the near-sinusoidal drawn, which exceeds, allows
During scope, it is believed that the curent change that the near sinusoidal with being drawn is not fallen within the output current of the frequency converter of the sampled point is bent
On line, the judge module 15 of motor status judgment means is judged as that motor is in overexcitation state.Specific judgment mode is as above
It is described, here, repeating no more.
Thus, also can be in the situation of the output current overcurrent of frequency converter using the motor status judgment means of the present invention
Under, the running status of motor is judged, thus, it is possible to confirm to need to be adjusted which parameter of frequency converter, to meet work
The requirement at industry scene.
In addition, the above-mentioned method for judging motor operating state can be previously stored in the control electricity of frequency converter as program
In the storage medium on road, the fortune of the judgement motor can be run during the entire process of control circuit controls transducer drive motor
The program of row state, but due to the necessity in motor normal operation, not judged its motor status, so in order to carry
The speed of service of high program, it is preferable that only when frequency converter starts motor, run the program of the running status of the judgement motor.
After the program is run, if can be set as motor is changed into normal operating condition from starting state, i.e. output current did not had
Electric current, and when motor speed is reached more than certain rotating speed, terminate the program of the judgement motor operating state, return normal
Operation program.
According to the motor status determination methods and motor status judgment means of the present invention, transducer drive motor is being utilized
During, during the output current overcurrent of frequency converter, the running status and motor that can simply and rapidly judge motor turn
The state of speed, in order to make appropriate counter-measure.
By judging the running status of motor, the function of frequency converter can be given full play to, allows motor control to realize
Automation, for different motor load and the condition of production, frequency converter can be matched automatically with motor load situation, ensure life
Production is smoothed out.
In addition, for the frequency converter of economizing type, the good judgement to motor status can expand the application model of frequency converter
Enclose and increase reliable run time, and be greatly saved the cost of core devices IGBT and associated components.
The foregoing is only presently preferred embodiments of the present invention, all equivalent changes done according to scope of the invention as claimed with
Modification, it should all belong to the covering scope of the claims in the present invention.
Claims (8)
1. a kind of motor status determination methods, it is used in the state of with transducer drive motor, the operation shape to motor
State is judged, it is characterised in that
Comprise the following steps：
The sampling step that current value and frequency to the output current of frequency converter are sampled,
According to the current value and frequency of the output current sampled, to draw drawing for the curent change curve of near sinusoidal
Step,
Judge the output current whether the alarming step of overcurrent,
In the case of being judged as that the output current is overcurrent in the alarming step, to the output current sampled
Comparison step of the current value compared with the curent change curve for the near sinusoidal drawn out,
According to the comparative result obtained in the comparison step, to judge the judgment step of the running status of motor,
In the judgment step, when the comparative result is in the current value of the output current of some sampled point and in institute
The difference of current value corresponding with the sampled point on the curent change curve for the near sinusoidal drawn out is not above holding
Perhaps during scope, it is judged as that motor is in the state of stall,
When the comparative result is described approximate with what is drawn out in the current value of the output current of some sampled point
When the difference of current value corresponding with the sampled point on sinusoidal curent change curve exceedes permissible range, it is judged as at motor
In overexcitation state.
2. motor status determination methods as claimed in claim 1, it is characterised in that
The sampling step has：
The first sampling step sampled to the frequency of the output current,
The second sampling step sampled to the current value of the output current.
3. motor status determination methods as claimed in claim 2, it is characterised in that
First sampling step includes：
The step of being sampled by zero-crossing comparator to the first zero crossing of the output current of frequency converter,
The step of being sampled by zero-crossing comparator to the second zero crossing of the output current of frequency converter, second mistake
Zero point is next zero crossing of first zero crossing,
According to the sampling time of first zero crossing and second zero crossing, to calculate the step of the frequency of the output current
Suddenly.
4. such as motor status determination methods according to any one of claims 1 to 3, it is characterised in that
Step is drawn described, the curent change that the near sinusoidal of the output current is drawn with Maclaurin formula is bent
Line.
5. a kind of motor status judgment means, it is used in the state of with transducer drive motor, the operation shape to motor
State is judged, it is characterised in that
Including：
The sampling module that current value and frequency to the output current of frequency converter are sampled,
According to the current value and frequency of the output current sampled, to draw drawing for the curent change curve of near sinusoidal
Module,
Judge the output current whether the alarm module of overcurrent,
In the case where the alarm module is judged as that the output current is overcurrent, to the output current that is sampled
Comparison module of the current value compared with the curent change curve for the near sinusoidal drawn out,
According to the comparative result of the comparison module, to judge the judge module of the running status of motor,
When the comparative result is described approximate with what is drawn out in the current value of the output current of some sampled point
When the difference of current value corresponding with the sampled point on sinusoidal curent change curve is not above permissible range, the judgement
Module is judged as that motor is in the state of stall,
When the comparative result is described approximate with what is drawn out in the current value of the output current of some sampled point
When the difference of current value corresponding with the sampled point on sinusoidal curent change curve exceedes permissible range, the judge module
It is judged as that motor is in overexcitation state.
6. motor status judgment means as claimed in claim 5, it is characterised in that
The sampling module has：
The first sampling module sampled to the frequency of the output current,
The second sampling module sampled to the current value of the output current.
7. motor status judgment means as claimed in claim 6, it is characterised in that
First sampling module includes zero-crossing comparator,
The first zero crossing of the output current of frequency converter is sampled by the zero-crossing comparator,
The second zero crossing of the output current of frequency converter is sampled by the zero-crossing comparator, second zero passage
Point is next zero crossing of first zero crossing,
First sampling module is described defeated to calculate according to sampling time of first zero crossing and second zero crossing
Go out the frequency of electric current.
8. the motor status judgment means as any one of claim 5~7, it is characterised in that
The depicting module draws the near sinusoidal change curve of the output current with Maclaurin formula.
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